Elo Deck....something wrong?

Elo Deck....something wrong?

I decided to make an ulu watu elo deck, and at first it was doing good. Mind you, I was already in the 950's because of my nightmare deck. I got up to 986 and then I started losing again! I don't know if I am not balancing out my deck correctly or what the issue is. I would greatly appreciate any advice everyone has.